mine came with greens, for a while i was using a pair of blue code in the inner pair sockets and left the greens in the outer sockets.. but now i have a quad of TAD 6L6GC STR.. which to me really change the overall sound of the amp(in a good way)!!! do not get me wrong, the stock power tubes are great.... the tad's would give you more bass, smooth mid and treble!!! to my surprise channel 2 mark1/thick's bass became more focus..